Hello, Oleg.

On Tue, Oct 23, 2012 at 05:39:19PM +0200, Oleg Nesterov wrote:

quoted

Hmm....  Guess we should drop __ from set_current_state.

Yes.

Or we can change ptrace_stop() and do_signal_stop() to use freezer_do_not_count/
freezer_count and remove task_is_stopped_or_traced() from update_if_frozen()
and try_to_freeze_tasks(). But this means that do_signal_stop() will call
try_to_freeze() twice, unless we add __freezer_count() which only clears
PF_FREEZER_SKIP.

Ooh, I like this idea.  If we have a mechanism to mark a task "frozen
enough", it makes sense to use it universally.  As long as
try_to_freeze() invocation stays outside fast path, I don't think
invoking it twice really matters.  Can you please cook up a patch for
it?

Thanks.

--
tejun